<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			/*
			加不加height都没有任何问题
			*/
			.a{
				border: 1px solid;
				line-height: 24px;
				/* height: 24px; */
			}
		</style>
	</head>
	<body>
		<div class="a">哦我都是的</div>
	</body>
</html>
